White Block Artifacts in Eevee Beta Renders?
I've been experiencing this as well; when it happens to me, it's occurring in geometry where there's a degenerate or zero-area face (e.g. take a polygon and scale it to 0 in two dimensions, so it's just a couple of lines occupying the same space), and the material applied to it has a normal map. If Depth of Field is turned off, it shows up as pure white pixels occurring randomly along the line; with it on, they're either small white squares or small white circles. (And if Bloom is also turned on, it looks like J.J. Abrams came by and dropped a massive lens flare into my scene.)